Power supply issue by Vin on Sipy + Deep Sleep Shield

robert-hh

@nespressif That sounds as if some other Pins that are connected with the expansion board interfere with the DS shield behaviour. You mentioned to use Expansion Board 2.
Does the behaviour change if you remove all jumpers from the expansion board, and if yes, which jumper makes a difference?

nespressif

@robert-hh No, I really only use the expansion board to program the Sipy, once programmed I no longer use it, I only use the Sipy+DS Shield+3.7v Lipo Battery, only these three elements and nothing else, connecting the positive to the Vin of the Shield and the gnd to the gnd of the shield, if I include in my program the get_wake_status() function does not work and without the function, it works fine.

I think it is a problem of the deepsleep.py library, the get_wake_status() function uses the functions self.peek() and self.magic() and within this self._send() function that uses self.uart.write(bytes(data)). I don't know how it works, but the error may be due to the fact that you want to write data to Uart and it doesn't have the expansion board connected, you don't have uart. But this is just a supposition of mine, I don't know how the library works.

robert-hh

@nespressif That was nto my intention. You said it works with Expansion boartd and does not w/o. So I suggested to get with the expansion board the electrical status w/o by opening all connections besides GND and Vin.

nespressif

@robert-hh Ok, I didn't make myself clear. What I mean is that if I use the expansion board to feed the Sipy+ds shield, the program with the function get_wake_status() works fine and doesn't break.

But I just want to use the Sipy+ds shield+3.7v lipo battery.

Please, read my previous comment, I think I explain myself better. I will also upload some photos soon.

robert-hh

@nespressif I understood your statements well. I suggested to test, whether it fails with expansion board, but all jumpers from the expansion board removed.

nespressif

@robert-hh Ok, as soon as I can try to remove the jumpers from the expansion board and try.

nespressif

@robert-hh I've already tried it, with the expansion board it works well with the jumpers as well as without them.

robert-hh

@nespressif That's .. interesting. I assume it is hardware related. And without the jumpers and without a SD card inserted, at least according to the 1.2 schematics of the expansion board, nothing stays connected but the button at P10, which is open, and Vin, GND and 3.3V. There are additional capacitors at 3.3V and Vin (10µ + 0.1µ). Of course, the wires on the board add a small capcitive load, but that should not change so much.

nespressif

@robert-hh Like I said before, I don't know much about electronics. I think it's a problem with the deepsleep.py library, but it strikes me that no one has reported the error before, because if you feed it with batteries through Vin, you can't use the get_wake_status() function and therefore, you can't know why he woke up. But let's see if someone from Pycom can solve something for us.

I have two questions about Deep Sleep Shield, to see if you can help me:

1.- What is the Deep Sleep Onewire Comm Pin (P10) for?
2.- Looking at the diagram I see that there are some Pins with voltage dividers. Can I use some pin of the Shield, to measure the charge of the battery that feeds it through Vin?

Thanks for your help

nespressif

To close this post, I wanted to say that the issues I found in the deep sleep shield, have already been reported before in this forum.
My mistake was not to do an exhaustive search before posting.

Conclusion: the deep sleep shield has quite a few problems when powered by a lipo battery.

*bradnz hace 12 meses
For any one interested, or has this issue in the future I have resolved this by doing the following:

Rolled back firmware to 1.7.9.b3
Used version 1.0.0 of the deepsleep.py file from github.

Works fine now.*

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